Zinc sulfate as an adjunct to methylphenidate for the treatment of attention deficit hyperactivity disorder in children: a double blind and randomized trial [ISRCTN64132371].

"This double-blind, placebo-controlled study demonstrated that zinc as a supplementary medication might be beneficial in the treatment of children with attention-deficit hyperactivity disorder"
Akhondzadeh S1, Mohammadi MR, Khademi M. BMC Psychiatry. 2004 Apr 8;4:9.
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